Use the Rest Parameter with Function Parameters In order to help us create more flexible functions, ES6 introd code example

Example 1: javascript multiply arguments

const mul = (...args) => args.reduce((a, b) => a * b);

// Example
mul(1, 2, 3, 4);    // 24

Example 2: the rest operator javascript

function sum(...numbers) {
	return numbers.reduce((accumulator, current) => {
		return accumulator += current;
	});
};
 
sum(1,2) // 3
sum(1,2,3,4,5) // 15